Playing-ball.



No. 7l`2,3a7. f Ilfaten'fmi Oct. 28,1902. E. KEMPSHALL'.

PLAYING BALL. (Application med may 14, 1902.)

1757/261363.- J/QM. f@

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UNITED STATE-s PATENT FFICE.

`ELEAZER KEMPSHALL, BOSTON, MASSACHUSETTS.

PLAYINGTBALL.

SPECIFICATION forming part of Letters Patent No. 712,387, dated October 28, 1902.

` `.Application filed May I4, 1902. Serial Nol 107,220. (No model.)

To @ZZ whom t may concern: Beit known that I, ELEAZERKEMPSHALL, a citizen ofthe United States, residing at Boston, in the county of Suffolk and State of Massachusetts, `have invented certain new Aand useful Improvements in Playing-Balls, of which the following is a specification.

This invention relates to playing-balls, and' especially to those used in the game of golf;

and its chief object is to increase the flying power of the ball while reducing the liability of rupture of the shell.

In the drawings forming part of this speciiication, Figure lis a part-sectional view of a ball made in accordance with my present improvements, and Fig. 2 shows a compound or double-rubber shell used in making the ball-core.

For the core I prefer to employ a4 sphere 1, Fig. 2, of firm but compressible rubber, which may be provided with a hard center piece 2, the rubber sphere being preferably expanded, as at l, upon said center piece,` and the latter preferably consisting of plastic material, such as gutta-percha. It is not es#` sential, however, in all cases that therubber sphere have a center piece, as it may be either hollow or in the form of a solid ball of rub- Upon the firm rubber spherefI vul-4 canize a thin layer 3 of pure rubber whichr is quite soft as compared with the firm'rubber sphere l.- Said layer 3 is likewise eX` Upon the core. I apply a shell 4, of `plastic material, prefer" ber.

panded by the core 2, as at 3a.

ably gutta-percha, and preferably holding the core under compression. Thus it will be seen that the core 1 of solid rubber is provided with a thin shell or iilm, which is in a tense condition. It will be further understood that when the outer shell 4 is depressed by a blow the soft-rubber Iilm 3ft is forced to ilow sidewise away from the area of depression, thus to a certain extent cushioning the blow and also calling into action a larger portion of the rubber core lfthan would otherwise be the case, and, further, 4byits own elasticity tending to restore the ball instantly to its normal spherical shape,`and hence'rendering it livelier.; It will also-be seen that one of the advantages of my invention resides in having the firm' supporting-sphere lf2 close to the sup- Aported shell4, this being rendered practicable by having the cushioning layer 3a very thin. I t will be understood that the shock of .the blow is taken largely by the rm rubber f sphere l, which is su Efficiently resisting to prevent undue indentation and bursting of the shell.

Changes in details may be resorted to within the scope of my improvements, and, if desired, other covers may be substituted for the shell 4.

Having described my invention, I claiml. A playing-ball comprising a sphere of "formedof plastic material and holding said sphere and casing under compression.

3. A` playing ball comprising a rubber sphere, a thin, softer rubber casing vulcan- `izedupou said sphere, and a cover of guttaipercha upon said casing and holding said core under compression.

` 4. A playing-ball comprising a firm rubber ,sphere in a state of expansion upon a harder center piece, a thin lm or casing vulcanized thereon and consisting of rubber softer than said sphere, and a hard shell holding said sphere and casing under compression.

5. As a new article of manufacture, a ball or a core consisting essentially of a shell of solid rubber which is firmbut compressible, combined with a relatively thin outer casing of softer rubber vulcanized thereon; said rubber shell being also filled with a relatively hard center piece.

- ELEAZEB. KEMPSHALL Witnesses:

B. C. STICKNEY, t Y

RALPH JULIAN SAoHERs., 

